数据库版本：Oracle 10.2.0.5 rac

操作系统版本：CentOS 5.6-64

1、出现问题：

1）后台alter日志没有任何错误

2）mmon报错内容如下

*** KEWRAFC: Flush slave failed, AWR Enqueue Timeout
*** 2013-02-17 10:46:15.419
*** KEWRAFC: Flush slave failed, AWR Enqueue Timeout
*** 2013-02-17 10:47:15.598
*** KEWRAFC: Flush slave failed, AWR Enqueue Timeout
*** 2013-02-17 10:48:15.783
*** KEWRAFC: Flush slave failed, AWR Enqueue Timeout
*** 2013-02-17 10:49:15.968

3）做awr报告是，没有最近的snapshot生成

2、问题排查：

1）查看锁和session

select do.object_name,
      do.object_type,
      gv.SQL_ID,
      gv.EVENT,
      gv.WAIT_CLASS,
      gv.WAIT_TIME,
      gv.PADDR
  from gv$locked_object gl, gv$session gv, dba_objects do
 where gl.SESSION_ID = gv.SID
  and gl.OBJECT_ID = do.object_id;

发现有awr相关的表锁住了

2）查看锁表的进程

select * from gv$process gp where gp.ADDR='00000002D8610778';

3）使用os命令

# ps -ef | grep 28039
oracle  28039    1  0 04:00 ?        00:00:16 ora_m000_west1
kill 掉m000就恢复正常

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